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Solve the problem of poor surface quality of CNC machined parts
by：Yifeng Metal
2022-02-21
Solve the problem of poor surface quality of CNC machined parts
1. Increase tool speed
Faster speed (measured in feet of surface per minute) means less contact time between the material and the cutting tool. This reduces edge buildup that results in poor surface finish and extends tool life. Tool failure is the leading cause of damage to precision machined parts. Never estimate or guess the speed required for your work.
2. Always Clear/Control Chips
Removing excess chips or built-up edges during machining and not allowing them to touch the workpiece is a critical task and key to producing a high quality surface finish. Chips and BUE tend to build up and, if not removed, can easily damage the surface finish of the tool. Chip breakers, compressed air and the best solution, overflow coolant can be used to remove chips for better control and reduce scratching/damage of parts.
3. Different tools should be used for roughing and finishing
To the uninitiated, once the milling process is complete and the delivery date is approaching, it may seem that it is only necessary to check the aesthetics of the precision machined part. Regardless of the material, a thorough inspection of the work done is a critical factor in the function of the part. Particularly suitable for the aerospace and medical device manufacturing industries. Excessive chipping, slow running speed, and improper tool use are the main reasons for the loss of surface finish. Lack of machine maintenance, low coolant levels, improper setup and CNC programming errors are also contributing factors. We offer heads for a variety of machining operations, including milling, turning and grinding, and if used consistently,
custom metal parts has become a standardized way of dealing with sheet metal manufacturing.
Dongguan Yifeng Metal Co., Ltd. strives to be the acknowledged global leader and preferred partner in helping our clients succeed in the world’s rapidly evolving financial markets.
When selecting the best products for customers, we considered not only the custom metal parts, but also the custom metal works.
The key to custom metal parts is understanding where there is a problem or need in certain markets and knowing how to solve it.
For the layman unfamiliar with CNC machine shop operations, once the chips stop flying, the CNC milled part is dropped, and another precision machine tool part is introduced, they may think that the final product is accurate and to specification. Unfortunately, this is not always the case. At any relevant CNC machining shop, the finished product will not be delivered to the customer until it has passed the inspection service process. The dimensions of the part must meet the tolerances set by its design, including a thorough inspection of the finish of all machined surfaces.
Typically, a part may fit a certain size but must be scrapped due to substandard overall appearance and surface finish. Not only does this cause aesthetic issues, but more importantly, it negatively affects the functionality of the part.
On top of that, in the final stages of the milling and machining process, the amount of work that has to be sent to the bin is less than the expected result. CNC machinists are naturally detail-oriented, take pride in their work, and want to see a complete project. Scrap parts due to surface finish issues can also be a real profit killer for a job shop. Poor quality can lead to increased costs, increased downtime, delayed deliveries, and in the worst case, lost orders.
1. Increase tool speed
Faster speed (measured in feet of surface per minute) means less contact time between the material and the cutting tool. This reduces edge buildup that results in poor surface finish and extends tool life. Tool failure is the leading cause of damage to precision machined parts. Never estimate or guess the speed required for your work.
2. Always Clear/Control Chips
Removing excess chips or built-up edges during machining and not allowing them to touch the workpiece is a critical task and key to producing a high quality surface finish. Chips and BUE tend to build up and, if not removed, can easily damage the surface finish of the tool. Chip breakers, compressed air and the best solution, overflow coolant can be used to remove chips for better control and reduce scratching/damage of parts.
3. Different tools should be used for roughing and finishing
Don't use the same tool as roughing for CNC precision machining services. Instead, use a small number of roughing tools to remove most of the material, and keep newer, sharper tools for finishing only. When used with roughing or finishing tools, the tool insert radius, rake angle, feed rate and insert material itself can lead to higher quality.
To the uninitiated, once the milling process is complete and the delivery date is approaching, it may seem that it is only necessary to check the aesthetics of the precision machined part. Regardless of the material, a thorough inspection of the work done is a critical factor in the function of the part. Particularly suitable for the aerospace and medical device manufacturing industries. Excessive chipping, slow running speed, and improper tool use are the main reasons for the loss of surface finish. Lack of machine maintenance, low coolant levels, improper setup and CNC programming errors are also contributing factors. We offer heads for a variety of machining operations, including milling, turning and grinding, and if used consistently,
custom metal parts has become a standardized way of dealing with sheet metal manufacturing.
Dongguan Yifeng Metal Co., Ltd. strives to be the acknowledged global leader and preferred partner in helping our clients succeed in the world’s rapidly evolving financial markets.
When selecting the best products for customers, we considered not only the custom metal parts, but also the custom metal works.
The key to custom metal parts is understanding where there is a problem or need in certain markets and knowing how to solve it.
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